Category: Design Patterns

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State Design Pattern

Many systems wait continuously for the occurrence of some event, and they react to the event by performing computations or changing their state. Once the event is handled, they go...

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Composite Design Pattern

According to the GoF book, the intent of the Composite pattern is to “compose objects into tree structures to represent part-whole hierarchies. Composite lets clients treat individual objects and compositions...

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Observer Design Pattern

The Observer Pattern According to the GoF book the Observer pattern “defines a one to many dependency between objects so that when one object changes state, all its dependents are...

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Command Design Pattern

The Command Pattern The Gang of Four’s book gives the following definition of the command pattern: “The Command pattern encapsulates a request as an object, letting you parameterize clients with...